Knife-sharpener



(N Model.)

G. GEBR.

KNIFE SHARPBNBR.

No. 439,799. Patented Nov. 4, 1890.

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ru: cams versus co.. mofa-umn., wnsnmarow n c UNITED STATES PATENT GEEICE.

GEORGE GEER, OF PETERBOROUGl-l, NE\V HAMPSHIRE.

KNIFE-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 439,799, dated November 4, 1890.

Application led April 6, 1886. Serial No. 197,942. (No model.)

To all whom it may concern:

Be it known that I, GEORGE GEER, a citizen of the United States, residing at Peterborough, in the county of Hillsborough, in the State of New Hampshire, have invented certain new and useful Improvements in Knife-Sharpeners, of which the following is a specification.

My invention relates to improvements in knife-Sharpeners of the class which consist of two grooved or threaded rollers placed side Aby side and mounted upon a frame, so as to revolve freely.

The object of my invention is to simplify the construction and to improve the efficiency of the instrument, and also to arrange the cutting-rollers upon a stationary frame.

In the accompanying drawings all of the figures are made upon an enlarged scale.

Figure l is a side elevation of my knife- Sharpener. Fig. 2 is a front elevation of the same, and Fig. 3 is a plan view.

A designates the frame having at one end a flange a', containing the screw-hole b, Fig. 2. I also provide the face of this flange with a little spur or spurs c. The other end of the frame A is provided with two rounded heads d d, with their faces offset a little, so as to lie in different planes, as shown most clearly in Fig. 2.

B B designate annular grooved rollers, which are mounted to turn loosely upon the headed shafts or rivets g g, by means of which rivets said rollers are secured to the heads of the frame. These rollers are of a peculiar form and resemble in side view ratchet-teeth# that is to say, one side of each ridge of the rolls is at right angles to its axis, while the other side of the ridge is at an oblique angle to the axis-thereby forming what might be tefrmed a series of truncated cones placed one upon the other. These rollers are hardened, so as to make their cutting-edges lasting. The diameter of these rollers is a little greater than the distance between their axes, so that when they are placed in position the ridges of the rolls overlap each other, the rib of one roller lying in the groove of the companion roller, as shown in Fig. 2. The oset faces of the heads d rl enable me to place the rollers in this position.

In use I make the frame A stationary by securing it to the vertical side of some sup-Y port-as, for instance, a window or door casing-at a convenient height for the operatorfor instance, about shoulder high. The line C in Fig. l indicates such a vertical face. In

thus setting the Sharpener 1n position that side of the grooves or ridges of the rollersl which is at right angles to their axes should be placed uppermost, as shown.

To sharpen a knife the edge at the heel is placed between the rollers b b and the knife drawn downward lengthwise through the rollers, giving it more or less pressure according to the hardness or softness of the knife. By mounting the cutting-rollers upon a stationary frame they are in a convenient position, always ready for use, and in use they will be less liable to cause the knife-blade to chatter or jar as it is drawn between them than is the case when a similar instrument is held in the hand.

I am aware that prior patents show a knifesharpener consisting, essentially, of a pair of screwthreaded rollers set side by side to loosely revolve upon their axes in a frame on the end of a handle; also that another prior patent shows a pair of annularly-grooved rollshows two disks lbeveled at their edges on side by side with their one side only and set All sharp edges directly opposite each other. of said prior art is hereby disclaimed.

I claim as my inventionl. The herein-described knife-Sharpener, consisting of the frame A, having the base or liange o, at one end for securing it in place and at the other end two rounded heads d d with their faces offset, so as to lie in different planes, and the two annular grooved rollers, each in the form of a series of truncated cones placed one upon the other, said rollers being loosely mounted on their axes against the offset faces of the heads d d, and with their ridges overlapping each other, substantially as described, and for the purpose specified.

2. The herein-described knife-Sharpener, consisting of a frame A, having the base or IOO flange a at one end for securing it in place and at the other end two rounded heads d CZ, and the two annular grooved rollers, each in the form of a series of truncated cones placed one upon the other, said rollers being loosely mounted on their axes With their ridges overlapping each other, substantially as described,

angle thereto, substantially as described,and for the purpose specified. y

4c. -In a knife-Sharpener having a frame and pivoted rollers provided with cutting-edges, the herein-described frame A, consisting of a body portion, the base 0r flange a at one end for securing the frame in place, and the two rounded'heads d d at the other end, the faces of said heads being oiset and in different planes, whereby two like grooved rollers secured to said offset faces have their cuttingedges in different planes, as described.

GEORGE GEER. Witnesses:

F. G. CLARKE, E. W. JONES. 

